Unit doublet

Abstract: The invention discloses a non-reference Lamb wave damage monitoring method based on a unit doublet piezoelectricity sensor array and time window functions, comprising the steps: arranging the unit doublet piezoelectricity sensor array in the structure; loading Lamb wave narrow band signals onto a piezoelectricity unit; performing further normalization process on the collected structural response signals; separating and obtaining structural impair scattered signals; obtaining structural scatteringin signals; judging structural impair condition. The method realizes separation of the scatteringin signals with direct sense signals, border reflection signals under the drive of initiative Lamb wave; having no use for the structural response signals under healthy condition as the reference signals, monitoring the structure at any time; without changing or increasing the device and the parameter, realizing only through a general hardware system; realizing monitoring without processing or computing impair characteristic parameters at the arrival of the impair scattered signal in the signals.